Defenition of the word coma

Defenition of the word coma
- A state of unconsciousness from which one may not wake up, usually induced by some form of trauma.
- A cloud of dust surrounding the nucleus of a comet.
- An optical aberration in an astronomical telescope which causes a V-shaped flare to the image of a star.
- (astronomy) the luminous cloud of particles surrounding the frozen nucleus of a comet; forms as the comet approaches the sun and is warmed
- a usually terminal tuft of hairs especially on a seed
- a state of deep and often prolonged unconsciousness; usually the result of disease or injury
- (botany) a usually terminal tuft of bracts (as in the pineapple) or tuft of hairs (especially on certain seeds)